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Method for evaluating on-line state of thin film capacitor

A film capacitor and state assessment technology, applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., can solve the problems of increased loss of film capacitors, failure of film capacitors, endangering system stability and safety, etc., and achieves strong applicability and calculation methods. Economical and practical effect

Inactive Publication Date: 2019-03-19
CENT SOUTH UNIV
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Problems solved by technology

But at the same time, with the increase of use time, the loss of film capacitors is also increasing, which eventually leads to the failure of film capacitors and endangers the stability and safety of the system.

Method used

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  • Method for evaluating on-line state of thin film capacitor
  • Method for evaluating on-line state of thin film capacitor
  • Method for evaluating on-line state of thin film capacitor

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Embodiment Construction

[0017] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the implementation shown and described in the accompanying drawings is only exemplary, intended to illustrate the principles and methods of the present invention, rather than limit the scope of the present invention.

[0018] See figure 1 , an online state assessment method for film capacitors, mainly includes the following steps:

[0019] Step A, testing the temperature characteristics and frequency characteristics of the film capacitor capacitance C of a specific specification and brand, and fitting a mathematical function;

[0020] Step B, extracting voltage ripple and current ripple information without DC bias from the film capacitor;

[0021] Step C, using the relationship between the voltage ripple and current ripple of the film capacitor to find the capacitance C;

[0022] Step D, the C value obtained in step C...

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Abstract

The invention discloses a method for evaluating an on-line state of a thin film capacitor. The invention aims to solve the problems of complex algorithm, small application range and incapability of anonline evaluation in the prior art. The method comprises the following steps of: step A, testing temperature characteristic and frequency characteristic of a capacitance C of the thin film capacitorwith specific specifications and brands, and fitting a mathematical function; step B, extracting voltage ripple and current ripple information without direct current bias from the thin film capacitor;step C, calculating the capacitance C by utilizing a relationship between the voltage ripple and the current ripple of the thin film capacitor; and step D, comparing a C value obtained in the step Cwith the C value of the same temperature and the same frequency obtained by using the function fitted in the step A to evaluate a health state of the thin film capacitor. The safety and the stabilityof a system are improved by monitoring the health state of the thin film capacitor in real time and carrying out a corresponding replacement treatment in time.

Description

technical field [0001] The invention relates to a film capacitor online state evaluation method. Background technique [0002] Capacitor is one of the three major passive components. It is almost ubiquitous in power electronic devices and has a wide range of applications. Film capacitors have become one of the most common capacitors due to their high energy density, high capacity and long life. But at the same time, with the increase of use time, the loss of film capacitors is also increasing, which eventually leads to the failure of film capacitors and endangers the stability and safety of the system. Therefore, it is particularly important to evaluate the state of film capacitors and predict their life states, especially in the power supply systems of rail traction, nuclear power plants, medical departments, electric vehicles and other facilities. Contents of the invention [0003] The purpose of the present invention is to provide a film capacitor online state evaluati...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 安振华张桂新李凯迪
Owner CENT SOUTH UNIV
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